Drummoyne Water Hardness & Quality Report (2026)

Drummoyne's drinking water is supplied by Sydney Water, treated at the Prospect Water Filtration Plant with an elevated Hawkesbury-Nepean component for the Canada Bay LGA inner western Sydney distribution in New South Wales. Water hardness in Drummoyne is measured at 176.5 mg/L — classified as moderately hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Drummoyne — a prestigious inner western Sydney suburb on Iron Cove in the Canada Bay LGA, known for the Drummoyne wharf and ferry services, the Drummoyne Pool and Bay Run foreshore walk along Iron Cove, the Drummoyne Oval, and the highly sought-after waterfront and residential character of this inner western Sydney community adjacent to Five Dock — receives moderately hard supply from the Prospect Water Filtration Plant distribution, significantly harder than the softer inner eastern Sydney coastal sub-zones.

Drummoyne's elevated hardness reflects an elevated Hawkesbury-Nepean component in the inner western Canada Bay Prospect distribution blend. The Hawkesbury-Nepean system traverses Cumberland Plain alluvial terrain and Triassic carbonate-cemented Hawkesbury Sandstone deposits contributing high dissolved calcium and minerals before Prospect treatment. The Drummoyne Canada Bay inner western distribution at 176.5 mg/L and TDS 405.1 mg/L reflects the substantially elevated mineralisation at the inner western Sydney Prospect distribution sub-zone, contrasting markedly with the much softer outer western (Smithfield 54.5 mg/L) and eastern (Bondi Beach 47 mg/L) Sydney sub-zones.

Drummoyne residents face moderate-to-significant limescale build-up on taps and in kettles — descaling every four to six weeks is typical. Hot water systems benefit from regular inspection. The elevated lead reading (0.004 mg/L) warrants briefly running the cold tap before use, particularly in Drummoyne's older brick and terrace housing. Sydney Water provides water quality information at sydneywater.com.au, with all ADWG health standards consistently met.